Remove some properties already in Coq standard library with the exact same statements.
Remove some properties already in Coq standard library with the exact same statements.

douglas-larocca/why3,jpdeplaix/why3,ssaavedra/why3,jpdeplaix/why3,douglas-larocca/why3,douglas-larocca/why3,jpdeplaix/why3,ssaavedra/why3,ssaavedra/why3